Wrench.



PATENTED AUG. 30, 1904.

I. B. STUMP.

WRENCH.

APPLICATION FILED FEB. 4. 1904.

N0 MODEL.

wwnmeo UNITED STATES Patented August 30, 1904:.

IRA E. STUMP, OF CLEVELAND, OHIO, ASSIGNOR OF ONE-HALF TO HENRY J. POPPENHAGEN, OF CLEVELAND, OHIO.

WRE CH.

SPECIFICATION forming part of Letters Patent No. 768,703, dated August 30, 1904, Application filed February 4, 190d. $erial No. 192,017. (No model.)

To (all whom it may concern:

Be it known that I, IRA E. STUMP, a citizen of the United States, residing at Cleveland, in the county of Ouyahoga and State of Ohio, have invented new and useful Improvements in Wrenches, of which the following is a specification.

This invention relates particularly to wrenches having an adjustable jaw slidable on the shank of the fixed jaw, and is especially directed to the means for adjusting the said movable jaw and for holding it in position as set, as will more fully hereinafter appear.

In the accompanying drawings, Figure 1 is a perspective view of the wrench. Fig. 2 is a longitudinal section thereof,

Referring specifically to the drawings, 6 i ndicates the fixed jaw, and 7 the shank extending therefrom, which shank terminates in a handle 8. The back of the shank is knurled or toothed, as at 9.

The movable jaw is indicated at 10, the back side or edge thereof being grooved between two side pieces 11 to take the shank 7 the front edge of which is preferably rounded, as indicated at 12.

Pivoted at 13 to the movable jaw are a pair of bent levers 14, which are located on both sides of the movable jaw and which swing in a plane parallel to the length of the shank. One arm of these levers extends backwardly beyond the toothed side of the shank, where it carries a knurled or toothed block 15 by a pivotal connection, (shown at 16.) The teeth or roughened face of the block is arranged to engage the teeth or knurls 9. The levers 14 are bent to substantially a right angle and at the thumb-pressure is applied, is of greater length than and extends beyond the arm 19, so that a leverage is produced which when the thumb-pieceis pressed turns the thumb piece on the arm 19 as a pivot and lifts or throws the pivot 18 outwardly or forwardly, which lifts the block 15 upwardly or backwardly and disengages the same from the teeth 9. A flat spring 20 is attached at one end to the movable jaw and presses at the other end against the arm 19, normally causing the levers let to hold the block 15 in engagement with the shank, the release being effected in opposition to the spring in the manner above indicated.

The strength of the grip of the Wrench does not depend on the toothed or knurled surfaces, but is effected principally by the peculiar leverage incident to the arrangement. Pressure on the movable jaw 10 lengthwise of the shank, such as would be produced in straining a nut, causes or tends to cause by the pivotal connection 13 an inward pressure on the block 15. The levers 14 naturally tend under such pressure to swing inwardly,.with the result that the harder the pressure the tighter the block is gripped to the back edge of the shank. The adjustment is quick, since pressure on the thumb-piece instantly disengages the block and shank and allows the adjustable jaw to be moved at once to the place desired. It is to be noticed that the shank has a slight taper from the handle to the fixed jaw, so that when straining a nut the grip tightensthat is, the grip of the movable jaw on the shank.

What I claim as new, and desire to secure by Letters Patent, is

In a wrench, the combination with a shank having at the end thereof a fixed jaw, the back of the shank being notched, of an inner movable jaw s'lidable on the shank, levers pivoted on opposite sides of the movable jaw, a block carried by the levers behind the shank and engageable with the notches therein, the engagement of the block with the shank being nearer the lixeil jaw than the pivotal conne l to this speciiicationin the presence of two subtion of the lever with the movable jaw, a pin extending between the encls of the levers, and

a thumb-lever carried by said pin and having 5 its fulcrum on the movable jaw, to operate said levers, substantially as described.

111 testiin ony whereof I have signed my name scribing witnesses.

IRA E. STUMP.

WVitnesses:

JOHN A. BOMMI-IARD'P, LOT'II E N EWB'URN. I 

